Tool retainer



, 1,594,425 w. G. NAISMITH TOOL RETAINER /6 Filed Oct. 21, 1919 I N VENTOR.

I /"IH" ATTORNEY.

Patented Aug. 3, 1926?.-

Si'llfit'llg PATENT OFFICE.

WILLIAM G. NAISMITH, DIE DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCKDRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OFDELAWARE.

TOOL RETAINER.

Application filed October 21, 1919,

The present invention relates to tool retainers, particularly of thattype employed on rock drills for holding the steel in the chuck.

The primary object is to provide means for effectively maintaining theretainer in its active position with respect to the tool, the holdingmeans permitting the retainer to be moved to an inoperative position.

An embodiment of the invention that is at present considered thepreferable one, is illustrated in the accompanying drawings, wherein:-

Figure 1 is a plan view of the front portion of a rock drill, with theretainer and the novel holding means for the latter in place.

Figure 2 is a perspective View of the same,

Figure 3 is a cross sectional view on the line 3-8 of Figure 1,

Figure 4 is a detail sectional view on the line 44: of Figure 1.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment illustrated, a tool holder 5 is disclosed, of wellknown type, which is held upon the front end of the barrel 6 by siderods 7. This holder is provided with the usual socket, opening throughone end and adapted to loosely receive the rear end of a tool, as 8,having a collar 9 thereon. The front end of the holder 5 is providedwith oppositely outstanding ears 10.

A tool retaining yoke 11 is employed, having an opening 12 through whichthe shank of the steer 8 will freely pass, the opening, however, beingof less width than the diameter of the collar 9. This yoke is providedwith side arms 13 slidably mounted in the ears l0, and capable ofpivotal movement therein. The limit of the rearward movement of the armsis determined by stop flanges 14; formed upon the side arms, and adaptedto abut against the front sides of the ears 10. The arms project beyondthe said ears 10, and located thereon, are coiled springs 15, the frontends of which bear against washers 16 that are abutted against the rearfaces of the ears 10. The rear endsof the springs 15 bear againstwashers 17 that abut against retaining nuts 18 threaded upon the rearends of the arms 13. The inner or front portions of the nuts, as clearlyshown in Figure 4, are reduced to form cy- Serial No. 332,191.

lindrical bearing surfaces 19, and on said portions are journaledrollers 20 retained between the bodies of the nuts 18 and the washers17. The tool holder 5 is provided with outstanding lugs 21, the outerfaces of which, as at 22, are concaved, forming seats in which therollers 20 are adapted to enga e. I

With this construction, it will be evident that when the yoke 11 is inits operative position, or in other Words, embracingthe shank of thesteel 8 in advance of the collar 9, the rollers 20 will be seated, asshown in Figures 1 and 3. These rollers therefore serve to hold the yokein its active or operative position. At the same time the yoke can beswung, whereupon the rollers will ride out of the seats 22 and down theinclined under cam faces 28 of the lugs 21, the arms having sufficientspring to permit this movement.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination with a tool holder, of a tool retainer including aside arm pivoted and longitudinally slidable on the side of the toolholder and having a swinging portion extending rearwardly beyond thepivot mounting, a spring for resisting the sliding movement of the sidearm and an element carried by the tool holder in rear of and spaced fromthe pivot mounting and detachably engaged by the rearward extension tohold the retainer in its active position with respect to a tool placedin the holder.

2. The combination with a tool holder having a tool-receiving socket inone end, of a tool-retaining yoke having side arms pivotally andslidably mounted on the socket and extending rearwardly beyond theirpivot mountings, springs on the arms for resisting their slidingmovements, and outstanding projections on the holder in rear of thepivotal mountings that are detachably engaged by the arms to hold theyoke in its active position v itlrrespect to a tool placed in theholder.

3. The combination with a tool holder, of a swinging tool retainerslidably mounted thereon, a spring for resisting the sliding movement ofthe retainer, a roller journaled on the retainer and movable therewith,and a seat for the peripheral portion of the roller that serves to holdthe retainer in a predeterinined position.

4. The combination with a tool holder,ot a .sivingingtoolretaining yokehaving side arms:pivotally and slidablymounted onthe holder, springs onthe'side arms :for resisting the sliding movements of the arms, rollersjournaled on the side arms and swinging therewith, and seats for theperipheral por tions of the-rollers to hold the retainer in an .activeposition. i v

5. Thercombination with a tool holder, of a sivinging tool retainermounted thereon, a retaining nut for .the .tool retainer-carriedthereby, and a holdingroller for the tool re tainer journaled 0n thenut.

6. The combination with a tool holder, of a swinging tool retainermounted thereon and capable of sliding movement, a spring resisting saidsliding movement, a bearing for I the spring including a nut on the toolretainer, and a holding roller for-the tool retainer journaled on thenut.

7. The combination with a tool holder having a tool receiv ng socket inone end and outstanding ears, of a tool-retaining yoke having side arms'slidably and .pivotalify mounted on the ears and projecting rear-"ardly beyond the same, coiled springs on the side arms, retaining'nutson the rear ends of the SlClQitlLdS havingjournal portions,-rollers onsaid journal portions, and outstanding lugs on the tool holder adaptedto be ridden over by the rollersand to hold the yoke in active positionwitharespect to a tool placed in the socket ofthe tool holder.

In testimonywhereoit', I afiizt my signature.

lVILLIAM G. NAIShHT-ll.

